<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .d1{
            width: 600px;
            height: 600px;
            display: flex;
            background-color: pink;
        }
        .d2{
            flex: 1;
            width: 100px;
            height: 100px;
            background-color: blue;
        }
        .s1{
            width: 100px;
            height: 100px;
            background-color: red;
        }
        a{
            width: 50px;
            height: 50px;
            background-color: orange;
        }
    </style>
</head>
<body>
    <div class="d1">
        <div class="d2"></div>
        <span class="s1">
            <a href="">111</a>
        </span>
    </div>
</body>
</html>